I have run both steel and plastic fenders offroad, and have yet to get into any serious trouble. You definitely need to be cognizant of how much clearance you have to avoid picking up debris. I probably wouldn't run knobbies with fenders. Too much danger of them pulling up a rock or something and getting lodged. Right now I'm using the Soma Rain Dogs, with the expectation that if somthing does get stuck they'll probably break apart rather than damage my frame/fork.
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